WireSizing
Wire gauge reference & calculator

Wire Size by Amperage

Quick reference: what wire gauge do you need for a given amperage? Based on NEC Table 310.16, 75°C insulation, copper and aluminum conductors.

Amps Copper Aluminum Breaker Common Use
15A 14 AWG 12 AWG 15A Standard lighting and outlet circuits
20A 12 AWG 10 AWG 20A Kitchen, bathroom, garage circuits
30A 10 AWG 8 AWG 30A Dryers, water heaters, small AC units
40A 8 AWG 6 AWG 40A Electric ranges, large AC units
50A 6 AWG 4 AWG 50A Ranges, hot tubs, EV chargers, sub-panels
60A 6 AWG 4 AWG 60A Sub-panels, large EV chargers, heavy equipment
70A 4 AWG 3 AWG 70A Large sub-panels, commercial equipment
80A 4 AWG 2 AWG 80A Large sub-panels, industrial feeders
100A 1 AWG 1/0 AWG 100A Main panels, large sub-panels, service entrance
125A 1/0 AWG 2/0 AWG 125A Service entrance, large main panels
150A 2/0 AWG 3/0 AWG 150A Service entrance, commercial panels
200A 4/0 AWG 4/0 AWG 200A Residential service entrance, commercial feeders